Digestion - Gut Tube and Digestion Path of Food Esophagus...

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Gut Tube and Digestion Path of Food Esophagus Stomach Small intestines Large intestines Rectum and anus Liver and Pancreas Digestion function Role in glucose metabolism
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Path of Food Mouth--chewing Pharynx--conscious swallowing Esophagusu--transport to stomach Stomach--mechanical and chemical breakdown Small Intestines-- chemical digestion and absorption Large Intestines-- resorb water, form feces Rectum---collect and expel feces
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Esophagus Pharynx to stomach Smooth muscle (conscious swallowing is in pharynx) Passes through esophageal hiatus in diaphragm, stomach against inferior diaphragm Cardiac orifice, with esophageal hiatus guard opening to stomach, prevent regurgitation GERD--gastroesophageal reflux disease Sometimes due to hiatal hernia Lower esophagus becomes ulcerous and precancerous Treat with antacids and other acid-reducing drugs
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Stomach STRUCTURE J-shaped but varies from “steerhorn” (high and horizontal) to vertically elongate (down to pelvis on tall, thin people) From esophagus (cardiac orifice) to small intestine (pyloric sphincter) Greater, lesser curvatures FUNCTION Mechanical breakdown of food--smooth muscle in wall Protein breakdown--pepsin secreted by epithelial lining Acidic conditions--for pepsin to work and to kill bacteria Absorption of water, ions and some drugs (e.g., aspirin, alcohol)
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Digestive Tract (adult gut tube) Wall Internal = Mucosa Epithelium Lamina propria Muscularis mucosae Middle = Submucosa CT w/ elastic fibers, nerves, vessels Outer = Muscularis Externa Inner circular layer Outer longitudinal layer
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Mucosa
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This note was uploaded on 12/28/2011 for the course STEP 1 taught by Professor Dr.aslam during the Fall '11 term at Montgomery College.

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Digestion - Gut Tube and Digestion Path of Food Esophagus...

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